Cutting – Processes – Cut advances across work surface
Patent
1984-05-11
1988-08-30
Yost, Frank T.
Cutting
Processes
Cut advances across work surface
83 72, 83789, 83796, 83801, 83820, B23D 5304, B23D 5508
Patent
active
047667907
ABSTRACT:
Band saw apparatus is disclosed which includes a drive assembly formed for support and guided movement of a saw blade for cutting of a workpiece, an endless band saw blade mounted to the drive assembly, and reciprocation apparatus formed for reciprocation of the blade toward and away away from the workpiece to enable see-sawing of the blade and variation of the force per unit area of the cutting edge of the blade on the workpiece while maintaining the same total force on the blade. To enhance toward and efficiency of cutting the blade drive assembly is mounted to the remainder of the saw to be substantially free to rebound or move away from the workpiece during reciprocation to avoid digging in or shearing off of the blade teeth and to permit close spacing of the blade guides next to the workpiece. The saw includes a control circuit for controlling the rate of movement of the saw arm away from and toward the workpiece to enable timing of saw arm rebound to blade displacement. The blade guides are reciprocated by the fluid piston-cylinder assemblies in synchronism or out-of-phase to vary the amplitude, frequency, speed and dwell during displacement independently of blade speed and at two locations along a length of the blade so as to produce see-sawing oscillation as well as simple reciprocation. The blade guide assemblies are provided with displacement means to permit guide assembly adjustment during cutting to maintain the guide assemblies in close proximity to the workpiece. Alternative blade displacement assembly constructions and a method for cutting workpieces employing the apparatus also are disclosed. The method includes variation of the feed rate of the saw blade down through the workpiece as a function of the width of the workpiece.
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Marvel Series 18 and 24 Hack Saws "Armstrong-Blum Manufacturing Co." Catalog 18/2400 of Chicago, Ill.
Phan Hien H.
Yost Frank T.
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